Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5352b236afaf9d47d608a99ff40a4a701d3ea39cfbc86bddd184e7b4855f9a' 
  AND token = 'FhBwzgzLtfode4rOATvQu/NT+54WKJy1nINTG7PEnBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}